In theory I think may affect the cold junction compensation a little, as would having long tracks between where the thermocouple terminates, and where the IC is located (as it measures temp on the IC to compensate)
I see no reason why it would cause a problem,
in particular the amplifier is likely Hi-z, and the source impedance of the thermocouple is low, like 1R ~ 10R depending on the particulars.
offsets introduced by using the switch (if there are any) would be the thing to look out for.

I know this was a while ago now, but you, m1x10, have demonstrated why those decoupling capacitors are needed on the sim card communications lines.
I would suggest to RobertC that m1x10’s experience and the comments from the datasheet should be enough to convince you that you should respin this design with the missing capacitors.

well your wrong about that… RoHS is hardly unreliable these days. It’s just that the people in control of manufacturing decisions are uneducated and scared of the change still.
How many products do you own that have the WEEE symbol on there (the wheelie bin with the cross on it)?
And what percentage of those products are faulty?
My guess is, you have stacks of them, and not many of them are faulty… I know thats the case for me…
Where the system is mission critical, the use of ‘Fail Safe’ PLC’s with double, or triple backed up control hardware is the protection mechanism… You think the early nuclear plants don’t get hardware failures?

Country of Origin indicates the last significant point of manufacture… its meaning is interpretable…
With regards to electronics, if you do a final assembly somewhere, its the country of origin… simple.

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